Individual particle morphology, coatings, and impurities of black carbon aerosols in Antarctic ice and tropical rainfall

Aja Ellis, Ross Edwards, Martin Saunders, Rajan K. Chakrabarty, R. Subramanian, Nicholas E. Timms, Arie van Riessen, Andrew M. Smith, Dionisia Lambrinidis, Laurie J. Nunes, Paul Vallelonga, Ian D. Goodwin, Andrew D. Moy, Mark A J Curran, Tas D. van Ommen

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    Abstract

    Black carbon (BC) aerosols are a large source of climate warming, impact atmospheric chemistry, and are implicated in large-scale changes in atmospheric circulation. Inventories of BC emissions suggest significant changes in the global BC aerosol distribution due to human activity. However, little is known regarding BC's atmospheric distribution or aged particle characteristics before the twentieth century. Here we investigate the prevalence and structural properties of BC particles in Antarctic ice cores from 1759, 1838, and 1930 Common Era (C.E.) using transmission electron microscopy and energy-dispersive X-ray spectroscopy. The study revealed an unexpected diversity in particle morphology, insoluble coatings, and association with metals. In addition to conventionally occurring BC aggregates, we observed single BC monomers, complex aggregates with internally, and externally mixed metal and mineral impurities, tar balls, and organonitrogen coatings. The results of the study show BC particles in the remote Antarctic atmosphere exhibit complexity that is unaccounted for in atmospheric models of BC.

    Original languageEnglish
    Pages (from-to)11,875-11,883
    Number of pages9
    JournalGeophysical Research Letteres
    Volume43
    Issue number22
    DOIs
    Publication statusPublished - 28 Nov 2016

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